Harbor Freight Tools 37792 User manual

Brand: Harbor Freight Tools

Model: 37792

Category: Power drills

Type: User manual

Harbor Freight Tools 37792, also known as Trailer Jack, is a device that makes hitching, unhitching, leveling, and moving the trailer safer and easier. It includes a heavy duty worm gear drive with a built-in gearbox, a grease fitting for easy lubrication, and a crank handle for manual operation. With a lifting range of 14 1/2 inches, it has a capacity of 550 lbs. load, excluding the load supported by trailer wheels. It can be mounted on either side of the trailer tongue, and pivot in either direction.

Trailer Jack

Model 37792

Assembly and Operating Instructions

3491 Mission Oaks Blvd., Camarillo, CA 93011

or any artwork contained herein may be reproduced in any shape or form without the

express written consent of Harbor Freight Tools.

For technical questions and replacement parts, please call 1-800-444-3353.

Important Safety Instructions

READ ALL INSTRUCTIONS AND

WARNINGS BEFORE USING THIS

PRODUCT.

COMMON SENSE AND CAUTION ARE

FACTORS WHICH CANNOT BE BUILT

INTO ANY PRODUCT. THESE FACTORS

MUST BE SUPPLIED BY THE OPERATOR.

PLEASE REMEMBER:

1. When using electric tools, machines or

equipment, basic safety precautions should

always be followed to reduce the risk of fire,

electric shock, and personal injury.

2. Keep work area clean. Cluttered areas

invite injuries.

3. Consider work area conditions. Do not use

machines or power tools in damp, wet, or

poorly lit locations. Do not expose equipment

to rain. Keep work area well lit. Do not use

tools in the presence of flammable gases or

liquids.

4. Keep children away. All children should be

kept away from the work area.

5. Guard against electric shock. Prevent body

contact with grounded surfaces such as pipes,

radiators, ranges, and refrigerator enclosures.

6. Stay alert. Never operate equipment if you

are tired.

7. Do not operate the product if under the

influence of alcohol or drugs. Read warning

labels on prescriptions to determine if your

judgment or reflexes might be impaired.

8. Do not wear loose clothing or jewelry as

they can be caught in moving parts.

9. Wear restrictive hair covering to contain long

hair.

10. Use eye and ear protection. Always wear:

-ANSI approved chemical splash goggles when

working with chemicals.

-ANSI approved impact safety goggles at other

times.

#37792

-ANSI approved dust mask or respirator when

working around metal, wood, and chemical

dusts and mists.

-A full face shield if you are producing metal or

wood filings.

11. Keep proper footing and balance at all

times.

12. Do not reach over or across running

machines.

13. Always check that adjusting keys and

wrenches are removed from the tool or machine

work surface before plugging it in.

14. Do not carry any tool with your finger on

either the start button or trigger.

15. When servicing, use only identical replace-

ment parts.

16. Check for damaged parts. Before using

any tool, any part that appears damaged should

be carefully checked to determine that it will

operate properly and perform its intended

function.

17. Check for alignment and binding of all

moving parts, broken parts or mounting fixtures

and any other condition that may affect proper

operation. Any part that is damaged should be

properly repaired or replaced by a qualified

technician.

18. Never force the tool or attachment to do

the work of a larger industrial tool. It is de-

signed to do the job better and more safely at

the rate for which it was intended.

IF THERE IS ANY QUESTION ABOUT A

CONDITION BEING SAFE OR UNSAFE,

DO NOT OPERATE THE TOOL!

Page 2

Thank you for choosing a Harbor Freight Tools product! For future reference please com-

plete the owner’s record below:

Model:_______________ Purchase Date:_________________

SAVE THE RECEIPT, WARRANTY AND THESE INSTRUCTIONS. IT IS IMPORTANT THAT

YOU

READ THE ENTIRE MANUAL TO BECOME FAMILIAR WITH THIS PRODUCT BEFORE YOU BEGIN ASSEMBLY.

______________________________________________________________________________

Specifications

Purpose: Jack mounts to side of straight trailer tongue. Once connected to the trailer, the Trailer Jack

makes hitching, unhitching, leveling, and moving the trailer a simple and safe procedure. The Trailer

Jack can be used on heavy farm duty trailers as well as recreational boat trailers.

The Trailer Jack is designed for permanent or semi-permanent attachment to the trailer tongue, and can

be available for use wherever the trailer goes.

Minimum Height: 8”

Maximum Height: 22 1/2”

Lifting Range: 14 1/2”

Capacity: 550 lbs. load (not including load supported by trailer wheels)

Designed with a heavy duty worm gear drive with built-in gear box. Includes a grease fitting for easy

lubrication.

______________________________________________________________________________

Unpacking

Carefully unpack the Trailer Jack and check all parts against the parts diagram and part number listing

on pages 6. Do not discard any packing material until the Trailer Jack is fully assembled and opera-

tional. If any parts are missing or broken, please call Harbor Freight Tools at 1-800-444-3353

Assembly

The Trailer Jack requires some minor assembly. Please follow the steps outlined below:

1. Place the Caster Wheel (#5) into the Caster Bracket (#4). Insert the Axle Bolt (#9), and tighten

with the Locking Nut (#10).

2. Install the wheel assembly shaft into the lower end of the Jack Shaft (#1). Screw in the Bolt (#12),

making sure that the Bolt sets in the grove of the wheel assembly shaft.

3. Place the Crank Handle (#3) on the shaft of the Jack Shaft, and align the flat surface to the handle.

#37792 Page 3

Assembly (continued)

Screw on the Locking Nut (#11) and tighten the nut securely.

4. Plan the location of the Trailer Jack. Examine both sides of the trailer tongue and choose the appro-

priate location for the jack, keeping in mind the mounting method, and the need to turn the Crank

Handle. The Trailer Jack is designed to be mounted on either side of the trailer tongue, and pivot in

either direction (caster wheel forward or to the rear).

5. Before installing the Trailer Jack, properly support the tongue of the trailer so that it is high enough

off the ground to provide clearance for the jack. Take precautions to insure the trailer is blocked and

will not roll.

6. Position the Trailer Tongue Assembly portion of the Trailer Jack on top of the tongue. Position the

loose plate of the Trailer Tongue Assembly underneath the tongue. Insert bolts through the top plate

and through to the bottom plate. Note the hole selections on the loose plate. Use the hole positions

which will best support your trailer tongue design. Install lock washers and nuts. At this time tighten

nuts only enough to hold the Trailer Jack in position for adjustment.

7. Inspect the position of the Trailer Jack. Check the squrareness of the mount position, and tap lightly

into alignment with a hammer and a wood block if necessary. Bolts should be at right angles to the

mounting plates. There should be proper clearance of the trailer tongue from the Jack Shaft. Once

determined that the Trailer Jack is properly positioned, tighten the nuts evenly, increasing pressure by

small increments on alternate bolts so that the mounting plates remain parallel. Nuts should be more

than tight enough to fully compress the washers, but not tight enough to damage the threads. Turn the

Crank Handle both ways to make sure the Trailer Jack is functioning properly.

8. Before operating the Trailer Jack, lubricate the grease fitting on the side of the Trailer Tongue As-

sembly. Use a good quality gear grease. Lubricate periodically while the Trailer Jack is in use.

Read and understand carefully the warnings and cautions described below as they pertain to

the operation of the Trailer Jack:

1. Be aware that the user/installer of this prod-

uct is solely responsible for the way the Trailer

Jack is installed, operated and maintained, and is

responsible for any and all consequences that

occur, whether or not anticipated in these

warning statements.

2. Never exceed the rated load capacity of 550

lbs. for the jack.

3. Never loosen, adjust, or take apart the top

and bottom plates of the Trailer Tongue Assem-

bly while the Trailer Jack is supporting any

weight.

4. Before each use, verify that the plates of the

Trailer Tongue Assembly and the trailer tongue

are securely attached, and that all bolts and nuts

are tight and in good condition.

5. Always keep feet, arms, and legs out from

under the trailer tongue while hitching, unhitch-

ing, or moving the trailer. Children should be

kept at a safe distance, and should never be

allowed to operate the Trailer Jack.

6. Always take precautions to prevent uncon-

trolled movement of the trailer when the Trailer

Jack is being used. Be cautious of the slope of

the road and be aware of the pull of gravity

when using this product.

#37792 Page 4

#37792 Page 5

Operation

Unhitching:

To use the Trailer Jack as an aid in unhitching the trailer, first make sure that the Trialer Jack is securely

attached to the trailer tongue. Check out bolt/nut connection to make sure the Trailer Tongue Assembly

is properly connected to the trailer tongue.

Take the neccessary precautions against uncontrolled trailer movement, and loosen the trailer hitching

mechanism. Attach the Crank Handle, if it has been detached in prior use, and turn the handle clock-

wise to increase the length of the Trailer Jack until the tongue has been lifted from the hitch ball. Keep

all body parts clear of the hitch, the tongue, and the area underneath the tongue.

Hitching:

To use the Trailer Jack as an aid in hitching the trailer, maneuver the trailer so that the trailer’s hitch is

directly over the towing vehicle’s hitch ball. Turn the Crank Handle counterclockwise to shorten the

Trailer Jack, and lower the tongue hitch onto the hitch ball. Tighten the hitch retainer mechanism.

Continue turning the Crank Handle until the Trailer Jack is fully retracted.

It is recommended that the Crank Handle be detached in preparation for towing. Keep all body parts

clear of the hitch, the tongue, and the area underneath.

Leveling and Moving:

In the unhitched mode, the trailer can be leveled or adjusted in pitch angle by turning the Crank Handle

in either clockwise or counterclockwise direction to lengthen or shorten the Trailer Jack. In this mode,

the trailer is a three wheeled vehicle that can be moved from one position to another, but only with

suitable precautions against uncontrolled movement. If the trailer is to be stored in this mode, it is

advised that the Crank Handle be detached and that the trailer wheels be properly blocked.

Towing:

When the Trailer Jack is attached while the trailer is being towed, the Trailer Jack must be fully retracted

(before towing begins, turn the Crank Handle counterclockwise until the Trailer Jack is fully retracted).

The Crank Handle needs to be removed and stored in a safe place while the trailer is being towed.

Part Number Listing and Parts Diagram

Grease Fitting

Part # Description Quantity

1 Jack Shaft 1

2 Trailer Tongue Assembly 1

3 Crank Handle 1

4 Caster Bracket 1

5 Caster Wheel 1

6 Bolt M10 x 120 4

7 Nylon Locking Nut M10 4

8 Washer 4

9 Bolt M12 x 80 1

10 Nylon Locking Nut M12 1

11 Nylon Locking Nut M12 1

12 Bolt M6 x 20 1

#37792 Page 6

Harbor Freight Tools 37792 User manual

Brand: Harbor Freight Tools

Model: 37792

Category: Power drills

Type: User manual

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Harbor Freight Tools 37792 User manual

Harbor Freight Tools 37792 User manual

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